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Did you upgrade your kernel recently?
First try modprobe ip_tables.
If that fails, make sure you have the source for your kernel installed, a symlink called /usr/src/linux should point there. As root cd to that directory and run 'make menuconfig' a curses interface will open up in the terminal. Use the arrow keys and spacebar to navigate to the category Networking Options. Hit M to activate IP Advanced Router and then move to the category Netfilter configuration and select Connection Tracking and IP Tables Support. After that hit escape until it asks you if you want to save your configuration, hit yes. Then enter the command 'make dep && make modules modules_install' Then try running modprobe again.
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